Use any() in scope

**Is your feature request related to a problem? Please describe.**
When we have extension resources can we use the any() function to provide the scope.

**Describe the solution you'd like**

For example
```bicep
var resourceType = 'Microsoft.Compute/virtualMachines'
var resourceName = 'vm0001'
resource dcra 'Microsoft.Insights/dataCollectionRuleAssociations@2021-04-01' = {
name: 'dcra1'
scope: any('${resourceType}/${resourceName}')
properties: {
dataCollectionRuleId: ''
description: 'trest12'
}
}
```

This will make it easier to have flexible and dynamic code where people can have input such as resourceType (Microsoft.Compute/virtualMachines) and resourceName (vm0001). The idea is that once a new resource supports dataCollectionRuleAssociations resource extension I do not have to update the code to provide support for that resource. If I have to use the current method once new resource supports the extension I have to do two things:
* add that resource as existing with if statement so it does not apply when different resource type is chosen.
* add another if to scope. You can imagine if I have 20 resource that support that extension the if will be quite big in code.

Start by reproducing the Bicep example using any('${resourceType}/${resourceName}') as the scope of an extension resource. Review how extension-resource scopes are currently validated and represented; done should allow this dynamic scope without resource-type-specific declarations or conditional scope logic.

Written by the indexing model from the issue text.